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Summarise the following paragraph

Input: Gene therapy is a technique used to treat genetic disorders by replacing defective or missing genes with functioning healthy copies. This therapy is also used to introduce beneficial or corrective genes into a patient’s body, helping to combat certain diseases or help the body resist them.

Output:
assistant
Gene therapy replaces defective or missing genes with healthy ones to treat genetic disorders, or introduce corrective ones into the body to fight or resist certain diseases.